Carbon: An essential element found in all living things, represented by the symbol "C". It has six protons, six neutrons, and six electrons.
Hydrogen: The lightest element on the periodic table, represented by the symbol "H". It has one proton and one electron.
Chlorine: A highly reactive halogen element represented by the symbol "Cl". It has 17 protons, 18 neutrons (in its most common form), and 17 electrons.